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|
module Concurrent
RSpec.describe Event do
subject{ Event.new }
context '#initialize' do
it 'sets the state to unset' do
expect(subject).not_to be_set
end
end
context '#set?' do
it 'returns true when the event has been set' do
subject.set
expect(subject).to be_set
end
it 'returns false if the event is unset' do
expect(subject).not_to be_set
end
end
context '#set' do
it 'triggers the event' do
latch = CountDownLatch.new(1)
t = in_thread{ subject.wait.tap{ latch.count_down } }
t.join(0.1)
subject.set
expect(latch.wait(1)).to be true
end
it 'sets the state to set' do
subject.set
expect(subject).to be_set
end
end
context '#try?' do
it 'triggers the event if not already set' do
subject.try?
expect(subject).to be_set
end
it 'returns true if not previously set' do
expect(subject.try?).to be true
end
it 'returns false if previously set' do
subject.set
expect(subject.try?).to be false
end
end
context '#reset' do
it 'does not change the state of an unset event' do
subject.reset
expect(subject).not_to be_set
end
it 'does not trigger an unset event' do
latch = CountDownLatch.new(1)
in_thread{ subject.wait.tap{ latch.count_down } }
subject.reset
expect(latch.wait(0.1)).to be false
end
it 'returns true when called on an unset event' do
expect(subject.reset).to be true
end
it 'sets the state of a set event to unset' do
subject.set
expect(subject).to be_set
subject.reset
expect(subject).not_to be_set
end
it 'returns true when called on a set event' do
subject.set
expect(subject).to be_set
expect(subject.reset).to be true
end
end
context '#wait' do
it 'returns immediately when the event has been set' do
subject.reset
latch = CountDownLatch.new(1)
subject.set
in_thread{ subject.wait(1000); latch.count_down }
expect(latch.wait(0.1)).to be true
end
it 'returns true once the event is set' do
subject.set
expect(subject.wait).to be true
end
it 'blocks indefinitely when the timer is nil' do
subject.reset
latch = CountDownLatch.new(1)
in_thread{ subject.wait.tap{ latch.count_down } }
expect(latch.wait(0.1)).to be false
subject.set
expect(latch.wait(0.1)).to be true
end
it 'blocks indefinitely' do
in_thread{ subject.wait }
sleep 0.1
end
it 'stops waiting when the timer expires' do
subject.reset
latch = CountDownLatch.new(1)
in_thread{ subject.wait(0.2); latch.count_down }
expect(latch.wait(0.1)).to be false
expect(latch.wait).to be true
end
it 'returns false when the timer expires' do
subject.reset
expect(subject.wait(1)).to be false
end
it 'triggers multiple waiting threads' do
latch = CountDownLatch.new(5)
subject.reset
5.times{ in_thread{ subject.wait; latch.count_down } }
subject.set
expect(latch.wait(0.2)).to be true
end
it 'behaves appropriately if wait begins while #set is processing' do
subject = subject()
subject.reset
latch = CountDownLatch.new(5)
5.times{ in_thread{ subject.wait(5) } }
subject.set
5.times{ in_thread{ subject.wait; latch.count_down } }
expect(latch.wait(0.2)).to be true
end
end
context 'spurious wake ups' do
before(:each) do
def subject.simulate_spurious_wake_up
synchronize do
ns_signal
ns_broadcast
end
end
end
it 'should resist to spurious wake ups without timeout' do
latch = CountDownLatch.new(1)
t = in_thread{ subject.wait.tap{ latch.count_down } }
t.join(0.1)
subject.simulate_spurious_wake_up
expect(latch.wait(0.1)).to be false
end
it 'should resist spurious wake ups with timeout', notravis: true do
latch = CountDownLatch.new(1)
t = in_thread{ subject.wait(0.5); latch.count_down }
t.join(0.1)
subject.simulate_spurious_wake_up
expect(latch.wait(0.1)).to be false
expect(latch.wait(1)).to be true
end
end
end
end
|
